title: Recovery of enlarged olefin metathesis catalysts by nanofiltration in an eco-friendly solvent.
abstract: This study was aimed at integrating a green separation process without phase change, namely nanofiltration, with olefin metathesis to recover the homogeneous catalyst. As the commercially available Hoveyda II catalyst was not sufficiently retained by the membrane, a set of homogeneous ruthenium-based catalysts were prepared to enhance the recovery of the catalyst by solvent-resistant commercial membranes made of polyimide (Starmem 228). The molecular weights of the catalysts were gradually increased from 627 to 2195 g mol(-1), and recovery was found to increase from around 70 % to 90 % both in toluene and dimethyl carbonate. The most retained catalyst was then engaged in a series of model ring-closing metathesis reactions associated to a final nanofiltration step to recover and recycle the catalyst. Up to five cycles could be performed before a deterioration in the performance of the process was observed.
authors.affiliation: CNRS - UMR Sciences Chimiques de Rennes, Université Rennes 1, Equipe Chimie et Ingénierie des Procédés, 263 avenue du général Leclerc, CS 74205, Bâtiment 10A, Case 1011, 35042 Rennes cedex, France.
authors.forename: Adel
authors.initials: A
authors.lastname: Keraani
authors.forename: Thierry
authors.initials: T
authors.lastname: Renouard
authors.forename: Cédric
authors.initials: C
authors.lastname: Fischmeister
authors.forename: Christian
authors.initials: C
authors.lastname: Bruneau
authors.forename: Murielle
authors.initials: M
authors.lastname: Rabiller-Baudry
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D002384:Catalysis; D005374:Filtration / Q000379:methods*; D005561:Formates / Q000737:chemistry; D055772:Green Chemistry Technology / Q000379:methods*; D008567:Membranes, Artificial; D036103:Nanotechnology; D012997:Solvents / Q000737:chemistry*; D014050:Toluene / Q000737:chemistry
chemical_list: D000475:Alkenes; D005561:Formates; D008567:Membranes, Artificial; D012997:Solvents; D014050:Toluene; C023025:methyl carbonate